The quadrature modulator is a fundamental radio component for worldwide digital wireless communication standards such as Global System for Mobile Communications (GSM), Digital Communications SystemsÐ1800 MHz (DCS1800), Digital European Cordless Telecommunications (DECT), American and Personal Digital Cellular (ADC/PDC), Japanese Personal Handy Phone (PHP RCR28). A typical system application and...

Modern mobile dispatching system can provide real-time monitoring and dispatching of moving vehicles via the support of different enabling technologies, such as, mobile communications, Global Positioning System (GPS), Geographical Information System (GIS), and embedded real-time system design. In this article, we present the design of a Modular Mobile Dispatching System (MMDS) for the distribut...

The growth of the mobile network system of which the cellular systems like Global System Mobile Communications (GSM) and Personal Digital Cellular (PDC) are representative and the IP network attracts worldwide attention. The IP network access through the mobile data network system is required strongly to use the useful IP services anytime and anywhere. Therefore on the mobile data network syste...

Global System for Mobile communications (GSM) is a popular mobile communications network. Short Message Service (SMS) is an easily adopted person-to-person communications technology for mobile devices. The GSM architecture allows for the insertion of mass application-generated SMS messages directly into the network infrastructure. This is achieved through a SMS Mobile Switching Centre (SMSC) us...

Global mobility and connectivity of mobile computing and communication can be satisfied by integration of existing and future communication networks. Techniques that can cope with the varying bandwidth, multiple networks and the latency of mobile accesses are essential for supporting performance transparency of mobile computing and communication systems of the future. In this paper, we present ...